Fairly minor UI bug, I haven’t seen it have any negative gameplay effects.
Whenever you add an Unhide action to I/O, it usually has the incorrect datatype set. A lot of them seem to use the Color datatype, which shows a color picker box, even though it does nothing. Sometimes it’ll be set to the “(INVALID)” data type, which can be seen by copying the outputs and pasting them into Notepad.
I haven’t found a consistent pattern to which items have an Unhide action set to Color, and which have invalid data types set, but it’s on most items. There might be other weird data types set on other items.
Presumably the solution is to just remove the data type field from Unhide, as Hide doesn’t seem to need one either.
Steps to Reproduce
Create an Unhide action in I/O.
Press Copy All Outputs.
Paste into Notepad or similar and see the DataType field being wrong.